Geology Study Guide Test 2
Geology Study Guide Test 2 GEOL 1100 - 001
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This 4 page Study Guide was uploaded by Margaret Notetaker on Sunday September 27, 2015. The Study Guide belongs to GEOL 1100 - 001 at Auburn University taught by John F Hawkins in Fall 2015. Since its upload, it has received 244 views. For similar materials see Dynamic Earth in Geology at Auburn University.
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Date Created: 09/27/15
TEST 2 STUDY GUIDE Multiple Choice 1 What type of sedimentary rock forms from organismal activity A Detrital C Biochemical B Bioerosion D Chemical 2 In dissolution a rock is A Completely dissolved C Both A amp B B Dissolved with residue D None of the above 3 Which are not mechanisms of transportation A Saltation C Traction B Lithi cation D Suspension 4 Turbidites have A Asymmetry C Desiccation B Loading D Compaction 5 Cross beds are A Waves of sand C Graded beds B Fined upwards D Oxidized 6 Transportation does not move in which medium A Water C Wind B Mud D Ice 7 Order from the most sorted to the least sorted A Sand Clay Silt C Clay Silt Sand B Sand Silt Clay D Siltstone Sandstone Conglomerate 8 What is a footprint in the dirt A Mold C Cast B Fossil D Brontosaur Bulge 9 A rock with high iron oxidation is what general color A Purpleindigo C Yellowbrown B Black grey D Redpink 10 A deltashaped deposit along the bottom of a mountain is an A Alluvial fan C Peat B Trace fossil D Unloading TEST 2 STUDY GUIDE Short Answer 1 Explain occulation 2 What is the process of sedimentary rock formation 3 Name and explain 2 types of chemical weathering 4 What is provenance and why is it important 5 Name and explain 3 types of mechanical weathering 6 What s the difference between an upside down and right side up mudcrack 7 Explain lithification TEST 2 STUDY GUIDE ANSWER KEY Multiple Choice HpWNP Wer NC gtUgtOUUOUUUUOO O Short Answer 1 Flocculation is the interaction between the charges in small sedimentary rocks The rocks are broken into small pieces by weathering and then further broken down through transportation The smaller the rock pieces the more surface area is exposed and can interact Flocculation happens when the charges between wellsorted rocks interlock making it hard to break the bonds So the interlocking charges in clay are harder to break than the interlocking charges in sand 2 First the rocks are weathered and worn down then they are transported by water or air Once the rock has been transported it is deposited and lithification can occur Weathering gt transportation gt deposition gt lithification 3 Hydrolysis and oxidation are two examples of chemical weathering During hydrolysis water is added to a mineral structure which makes the mineral structure soft and able to rearrange Example 2KAlSi308 H20 2H gt 2K AIZSi205OH4 4Sio2 During oxidation 02 is combined with an iron and the 02 changes valance ionic state This is also seen in rusting Example 61 120 2FeleO4 4 02 gt 4FeOH3 4 SlOz 4 Provenance is the parentage of a rock and can be used to identify the original location of the different pieces Using provenance the past movements and interactions of continents can be deduced as well as the movement of rocks 5 Pressurerelease usually happens to rocks that are buried underground The rocks are released by erosion and when that pressure is released from the rock the part above ground cracks TEST 2 STUDY GUIDE Freezethaw happens in areas that are cold enough for freezing and warm enough for thawing Water seeps into the cracks of the rocks and freezes when the temperature drops low enough The frozen water expands widening the cracks in the rocks and thaws when the temperature rises back up The water then seeps deeper into the cracks and creates more cracking over time Abrasion is when rocks bump into each other repeatedly and little pieces break off This usually happens in streams or rivers as the current throws rocks together Water movement through rock can also create channels because the water movement over time cuts the rock 6 When mudcracks dry out they curl up at the edges A normal mudcrack will curl up at the edges like a smile but an upside down mudcrack will curl downwards like a frown 7 Lithification is the consolidation of all the different pieces of rocks The rocks are pushed together to remove excess pore space then cemented by other minerals
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